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Meet the 'twins'
Jacob and Jackson or as they were known Aziel and Armazi
Like I said before, Jacob had a twin who died in the womb but his spirit/soul fused with Jacob's and he became one with Jacob. Also becoming what is called his 'dark side'. Diavolo is the only person Jacob told this too as he didn't bother to tell other people. But I guess that Phoenix can see Jackson as he appears as a spirit that's always following Jacob